This study has closely examined the poetic features exposed in the forms of Cifu for the purpose of preparing a basis to understand the artistic characteristics and literary worth of Cifu which was quite influential throughout the history of Chinese literature. First a careful examination of the essential differences between poetry and prose will present the universal criteria to definitely distinguish between poetry and prose from the form-based perspective. One of the essential features of poetry is that poetry is composed of words of song, which are characterized to have rule-restricted rhythm. Basically the rhythmic essence of poetry consists in its sentence form focused on rhyming with two verses composing one couplet. Rhyming is one of the most distinguished elements in the history of the ancient Chinese literature, the existence of which determines whether certain literary works belong to poetry or prose from the form-based perspective.